HIGHLEAD GC20618 Series Instruction Manual
HIGH
LEAD
GC20618 Series
Purchasing
Dept
Copy
Compound-Feed,Heavy
Material
Lockstitch Sewing
Machine
Instruction
Manual
Parts
Catalog
SHANGHAI HUIGONG
N0.3
SEWING MACHINE FACTORY
From the library of: Superior Sewing Machine & Supply LLC
From the library of: Superior Sewing Machine & Supply LLC
PARTS
CATALOG
1.
Arm bed
its
accessories
------------------------------------------------------------------------
17
2.
Thread tension regulator mechanism-----------------------------------------------------------
19
3.
Arm shaft
mechanism--------------------------------------------------------------------------
22
4.
Upper shaft & presser foot mechanism
-------------------------------------------------------
24
5.
Needle bar & thread take-up lever mechanism
------------------------------------------------
27
6.
Stitch regulator mechanism
-------------------------------------------------------------------
30
7.
Lower shaft & feed rock shaft
mechanism-----------------------------------------------------
32
8.
Hook saddle mechanism
----------------------------------------------------------------------
35
9.
Knife mechanism ( I ) ----------------------------------------------------------------------- 37
10.
Knife mechanism
(II)
------------------------------------------------------------------------
39
11.
Touch back mechanism & detector mechanism
-----------------------------------------------
42
12.
Oil lubrication mechanism
--------------------------------------------------------------------
44
13.
Accessories------------------------------------------------------------------------------------
47
GAlJGIC
J>ARTS
LIJ\T
-------------------------------------------------------------------------
50
From the library of: Superior Sewing Machine & Supply LLC
CONTENTS
PRECAUTIONS
BEFORE
STARTING OPERATION--------------------------------------I
PREPARATION
FOR
OPERATION
I.
Power cable connection
-----------------------------------------------------------------------2
2.
Connection
of
control box
----------------------------------------------------------------------3
3.
Adjustment
of
needle bar stop position
---------------------------------------------------------3
CAUTIONS ON USE
I.
Oiling
(I)
---------------------------------------------------------------------------------------4
2.
Oiling (2)
---------------------------------------------------------------------------------------4
3.
Oiling condition
---------------------------------------------------------_:
______________________
4
4.
Adjustment
of
oiling
to
rotating hook
-----------------------------------------------------------5
5.
Cautions on operation
--------------------------------------------------------------------------5
OPERATION
1.
Installation
of
needles----------------------------------------------------------------------------
5
2.
Winding
of
bobbin thread
-----------------------------------------------------------------------5
3.
Se
Iection
of
thread
------------------------------------------------------------------------------
6
4.
Threading
of
needle threads
---------------------------------------------------------------~----6
5.
Adjustment
of
feed (stitch) length and stitch reversing (touch-back)
----------------------------7
6.
Setting
of
bobbin
-------------------------------------------------------------------------------7
7.
Threading
of
bobbin threads
--------------------------------------------------------------------7
8.
Tension adjustment
of
bobbin threads
----------------------------------------------------------8
9.
Balance
of
thread tension
----------------------------------------------------------------------
8
10.
Needle thread tension
---------------------------------------------------------------------------8
1I. Adjustment
of
presser foot pressure --------------------------------------:-----------------------8
12.
Timing between rotating hook motion and needle motion
--------------------------------------8
13.
Adjustment
of
feed dog height
-----------------------------------------------------------------9
I4. Relationship between rotating hook motion and take-up lever motion
------------------------
IO
15.
Relationship between hook motion and opener motion
---------------------------------------
I0
16.
Relationship between needle motion and feed dog motion
------------------------------------
I0
17.
Safety clutch device
--------------------------------------------------------------------------
II
I8. Upper feed adjustment (needle
side)---------------------~-------------------------------------
12
19.
Outside presser foot and inside presser vertical stroke adjustment
----------------------------
I2
20.
Adjustment
of
forward/backward stitch length
------------------------------------------------
I2
21.
Installation
of
movable knife
-----------------------------------------------------------------
I3
22.
Adjustment
of
thread trimmer
cam-------------------------------------------------------------
13
23.
Adjustment
of
needle threads tension release assembly
----------------------------------------
I4
24.
Adjustment
of
scissoring pressure
of
movable knife and fixed
knife---------------------------
I4
25.
Sharpening
of
fixed knife
----------------------------------------------------------------------
15
26.
Adjustment for change
of
needle
to
needle distance--------------------------------------------
15
SPECIFI<:ATIONS ------------------------------------------------------------------------------
16
From the library of: Superior Sewing Machine & Supply LLC
PRECAUTIONS
BEFORE
STARTING OPERATION
1.
Safety precautions
I) When turning the
power
on, keep your hands and fingers
away
from the
area
around/under the
needle and the area
around
the pulley.
2)
Power
must be turned
off
when
the machine
is
not used,
or
when
the
operator leaves his/her seat.
3) The power must be
turned
off
before tilting the machine head, installing or removing the
"V"
belt
adjusting the machine,
or
when
replacing.
4) Avoid placing fingers, hairs, bars etc. near the pulley,
"V"
belt,
bobbin
winder
pulley, or motor
when the machine is operation. Injury could result.
5) Do not insert fingers into the thread take-up cover,
under/round
the needle,
or
pulley when the
machine
is
in operation.
6)
If
a belt cover, finger guard,
and/or
eye guard are installed, do
not
operate the machine without
these safety devices.
2.
Precaution before Starting Operation
I) If
the machine's oil pan has an oil sump, never operate the
machine
before filling
it.
2) If the machine
is
lubricated by a drop oiler, never operate the
machine
before lubricating.
3) When a new sewing machine is first turned on, verify the rotational direction
of
the pulley with
the power on. (the pulley should rotate counterclockwise
when
viewed
from the pulley.)
4) Verify the voltage and (single or three) phase with those given on
the
motor nameplate.
3. Precaution for Operating Conditions
1)
Avoid using the
machine
at abnormally high temperature (35°C
or
higher)
or
low temperature (5
°Cor lower). Otherwise,
machine
failure may result.
2) Avoid using the
machine
in
dusty conditions.
3) Avoid using the machine in areas where too
much
electrical nmse, resulted from the
high-frequency welder
anc
nthr~rs,
is
generated.
-1-
From the library of: Superior Sewing Machine & Supply LLC
PREPARATION
FOR
OPERATION
Overall view
of
assembled
sewing machine
1. Power cable connection
Touch
back
swich
1)
Connection
to·
Power Supply
Balance
wheel
(included
synchron1zer)
Control
box
When connecting the
power
supply connector to the control box, the connector should be completely
plugged
in
the proper receptacle after confirming the connector type and matching direction.
A.
In
case
of
three-phase electrical power system, the
"U"
phase should be connected to the red lead,
the
"V"
phase to the white lead, and the
"W"
phase to the black lead.
The
motor rotary direction
depends, however, upon the setting
of
the internal switch
in
the control box as described
in
Paragraph 1-(3)
CAUTION: The green wire must be connected to the ground terminal
in
order to ground
the motor properly.
B.
The appropriate
power
fuse capacity
is
as follows.
Power
supply 200V-240V: I
OA
IOOV-120Y: 15A
2) Lamp Leads
A. When installing the illuminating lamp(6V,15-20W),The connecting wire
is
attached on the
~---------------------------------------.
back
of
the Control box.
It
should be
(b)
Insulating
tape
(2
to
3
turns
wrapped)
removed and connected by
removing the insulating tube
from the wire and stripping
properly. The wire connections
should be, then, insulated by
(a)
Bare
wire
Lamp
leads
--2--
Insulating
tape
(2
to
3
turns
wrapped)
Lamp
leads
From the library of: Superior Sewing Machine & Supply LLC
2.
wrapping insulating tape on the wires.
CAUTION:
The
power switch must be
Turned
off before connecting the lamp.
B.
When the illuminating lamp
is
not used, the end
of
the lamp leads
must
be insulated as (a) or (b) as
shown
in
the figure
on
right side.
If
a short circuit occurs failing to insulate, the transformer
in
the
control box will be possibly burned out.
CAUTION:
The
illuminating lamp must not be connected
with
any heater, such as a foot
warmer
and
others, in parallel. Otherwise, the
load
capacity will be exceeded.
It
may cause
transformer
winding
burned
out.
3)
Rotary
direction
It
is
possible to change the rotary direction
of
the motor by
removing
the rubber cap from the
bottom left side
of
the front
cover
on the control box, and push
the
internal direction selector
switch.
The
built-in lamp in the internal switch
is
off
when the motor is rotating counterclockwise as
facing to the motor pulley, and
on
when rotating clockwise.
The
rotary
direction has been set to
counterclockwise as facing to the motor pulley, matching with the
machine
prior to shipping
Connection
of
control
box
The control
box
should
be connected
as
shown to the right.
Note:
(1)
Be
sure to
turn
the power switch
off for safety before connecting
or disconnecting the connectors.
(2)
The combination
of
the machine
heads with
the
motor
control
panels
are
specified below.
Use
special
care
for the
correct
Operation
box
---\-
-
~----
--
-
Round
hole
in
table
combination when replacing the machine head
or
motor control panel.
3.
Adjustment
of
needle
bar
stop
position
1)
Adjust
of"UP"
position
When the pedal
is
kicked down by heel, the
machine stops at
"UP"
position.
If
the marks
deviate larger
than
3 mm, adjust as follows.
a)
Disconnect the
plug
(12 pins)
of
cable from
the machine head.
b)
Run the
machine
and stop at
"UP''
position.
c) While holding the pulley, insert the "adjusting
~-----------------------------------,
white mark
"UP"
position
Black mark "DOWN"position
--3--
From the library of: Superior Sewing Machine & Supply LLC
tool" in the hole" A", then remove the tool.
2) A.djust
of
"Down"
position
When the pedal is "Neutral" the machine stops
at
"Down"
position.
If
the marks deviate large
than 5 mm, adjust as follows.
a) Disconnect the plug (12 pins)
of
cable from
the machine head
b) Run the machine and stop at
"Down"
position.
Adjusting
tool
AFTER
c) While holding the pulley, insert the "adjusting tool"
in
the hole
"8",
then remove the tool.
3) Confirm the stop operation, then set the plug (12 pings) coming from the machine head into the
receptacle.
CAUTIONS ON USE
1.
Oiling (1)
Fill the oil reservoir with oil up to
"H"
mark.
Oil level should be periodically checked.
If
oil
level
is
found below
"L"
level replenish oil to
"H''
level.
For oil, Use white spindle
oill.
2.
Oiling (2)
When a new sewing machine is used for
the first time,
or
sewing machine left out
of
use for considerably long time is used
again, replenish a suitable amount
of
oil to
the portionsindicated by arrow in the below
figure
3.
Oiling condition
See dripping
of
oil through the oil sight
hole to check oiling condition during operation.
-4-
From the library of: Superior Sewing Machine & Supply LLC
4. Adjustment
of
oiling to
rotating
hook
5.
Cautions on
operation
a)
When the power
is
turned on
or
off, keep
foot away from the pedal.
b)
It
should be noted that the brake
may
not
work when the power is interrupted
or
power
failure occurs during
sewing
machine operation.
c) Since dust
in
the control
box
might cause
malfunction or control troubles, be sure to keep the control
box
cover
close during operation.
d) Do not apply a multimeter to the control circuit for checking;
otherwise
voltage
of
multimeter
might damage semiconductor components
in
the circuit.
OPERATION
1. Installation of needles
Note: Before installing the needles, be sure to
turn
off
the power.
Double
Needle
Insert
tho
noodle
upto
the
boHDm
of
noodle
clamp
and
tighton
Insufficient
tho
acrow
keeping
tho
long
grow
aida
of
noodle
face
to
face
insertion
Needle
distorted
Single
Needle
X
2. Winding of bobbin
thread
X·
Long
groove
left
side
Note: When bobbin
thread
is
wound, keep the presser foot lifted.
Adjustment:
Tension
of
wound thread
Conically wound thread
Length
of
wound thread
Slack winding
is
recommended for polyester thread
and nylon thread.
Move the thread guide toward smaller diameter
of
wound thread layer.
Loosen the thread length adjusting screw to increase length
-5-
Nut
From the library of: Superior Sewing Machine & Supply LLC
of
thread and tighten the screw to decrease length
of
thread.
--~-~---------------
-------.
3. Selection
of
thread
Wir,ding amount
adjusting
scrtM>
It
is
recommended to use
"S"
twist thread
in
the left
needle (viewed from front), and
"Z'
twist thread
in
the
right needle. When discriminate use
of
needle threads is
impossible, use
"Z"
twist thread in both the needles.
For bobbin thread,
"S"
twist thread as well as
"Z"
twist
thread can be used.
4. Threading
of
needle threads
a) Pass each needle thread through thread guide A
Note: When thin slippery thread (polyester Thread
or
filament thread, for example)
is
used pass the
thread through thread guide B as well.
b)
With the take-up lever located at the upper most position,
pass each needle thread
in
the order shown
in
the
following figure.
Note: Pressing the upper
thread loosening button
shown
in
the figure below
opens the saucer
of
the
upper thread tension
adjuster, and the upper
thread can easily pulled out.
Needle thread tenSion releasing button
Lead the
thread
leftward. thread
rightward
-6-
X 0
E-.e-n
"""'("''9
..........
th
~·'n()!Jt\(
Qf
80'!<.
.)1
'.!II
~<lC-<J(>!•,•
[i,J_iJ •
lfiDJI
(Detail
I
GC2061
8-
I
-D
From the library of: Superior Sewing Machine & Supply LLC
5. Adjustment
of
feed (stitch) length and stitch reversing (touch back)
Note:
To
make feed (stitch) length smaller, depress the feed reverse lever and set the feed
length setting dial
to
a desired position
Touch-back button
...
Direction
of
stitching can be reversed by
depressing
this button.
Stitching goes
on
in reversed direction while the button
is
held
down,
and returns to forward
direction when the button
is
released
..
feed
length
setting
dial
k
~
6. Setting
of
bobbin
a) Pulling
out
S.cm thread tail from the bobbin.
b)
Hold the bobbin so that the bobbin thread
is
would
in
right direction and put it into the hook.
7. Threading
of
bobbin threads
a) Put the
hook
into the bobbin case and press
down
the latch
CD.
The thread
end
should
be left on the bed .
b)
While holding the
two
needleThreads by left
hand, rotate the hand-wheel one turn by right
hand.
By
pulling up the needle threads, as shown
in
the figure, the bobbin threads will be lifted.
Each
combination
of
bobbin thread and needle
thread should be
aligned
and led backward.
-7-
From the library of: Superior Sewing Machine & Supply LLC
8. Tension
adjustment
ofbobbin
threads
Tension
adjusting
screw
10. Needle
thread
tension
• Needle thread tension should be adjusted in
reference to bobbin thread tension.
•
To
adjust needle thread tension, turn each tension
adjusting nut.
• Needle thread tension can be also adjusted for
special fabric and thread by changing intensity and
movable range
of
slack thread adjusting spring.
11. Adjustment
of
presser
foot pressure
Pressure to fabric(s) can be adjusted by turning the
pressure adjusting screw.
12. Timing between rotating hook motion
and
needle motion
(1) Set feed length (stitch length) to
"6"
on the feed
setting dial.
(2) When needle is lifted 2.4mm from the lower dead
point, as shown in Figure, the following positional
relationship should be maintained.
The upper edge
of
needle eye should be
2.3mm below the hook point.
• The hook point should be located at the
center
of
needle axis.
• Gap between the hook point and the side face
of
needle should be
O.O.Smm.
-8-
9.
Balance
of
thread
tension
A 0
,2
==~CJI
il~
Balance tension
BX
2:::~
1 1
1;?
1
nQht
needle
or
loose
bobbin tension
ex/~
~~~orognt
bobbin tension
Gap
between
hook
point
and
upper
edge
of
needle
eye
Needle
lift:
2.4mmfrom
needle
lower
dead
point
Center
of
needle
axis
From the library of: Superior Sewing Machine & Supply LLC
II
Positioning
of
hook
point
(1) When the needle is at
DOWN
position, the smaller
Crossed heli.cal gears
on
the right side and left side
should be engaged with the large wheel so that the
"S"
screw
of
the former gear
comes
on the front side,
and that
of
the latter
gear
on
the reverse side.
(2) Tighten each
"S"
screw, where is punched for
set screw, on the
hook
shaft.
(3) Approximate position
of
hook
"C"
screw
of
hook
should be found close to the needle when the needle
is
at
DOWN
position.
finely adjust timing between the needle motion and
hook motion, loosen the set screw
of
larger gear
wheel and move the gear wheel in its axial direction
within a range from 1mm to 2mm.
13. Adjustment
of
feed dog height
Height
of
feed
dog
and pressure
of
presser foot should
be adjusted for individual fabric(s) with the following
cautions:
Fabric will be damaged
if
the feed dog extends too high,
or pressure
of
presser foot
is
too large.
Even stitch length cannot be assured
if
the feed dog
is
too low or pressure
of
presser foot
is
toe small.
Feed dog height should be measured at the point where
the needle is at the top position.
For light fabrics
For usual fabrics
For heavy fabrics
Adjustment procedure
Approx. O.Smm from throat plate
Approx. l.Omm from throat plate
Approx. 1.2mm from throat plate
a) Lean the machine head backward.
b)
Tum
the hand wheel by hand and stop
wh<::n
the feed
dog rises to the maximum height.
c) Loosen the feed bar set screw.
1-2mm
c,
~
~
j
Noedlo
DOWN
position
1-2mm
lmm
1.2mm
d) Vertically move the feed bar (in the direction indicated by arrow in the figure) to adjust
it
to
adequate height.
-9-
From the library of: Superior Sewing Machine & Supply LLC
e) After the adjustment, tighten the feed bar set screw.
• The feed dog height
is
factory-adjusted to 1.2mm
14. Relationship between
rotating
hook
motion
and
take-up
lever motion
When the timing belt (toothed belt) was removed for
its replacement, for example, the relationship between
rotating hook motion and take-up lever motion should
be adjusted
as
follows:
a)
Tum the balance wheel and stop when the take-up
lever
is
lifted to its upper dead point.
Black
line
on
boss
of
lower
shaft
bearing
Timing
belt
sprocket
b)
Lean the machine head backward and make sure the arrow (timing mark) put on the timing belt
is
in
lipe with the black line on the boss
of
lower shaft bearing.
c)
If
the timing mark
is
not in line with the black line ,remove the timing belt and install it again to
adjust.
15. Relationship between hook motion
and
opener
motion
a)
Tum the balance wheel by hand and stop when
the opener holder
is
located most remotely from
the throat plate.
b)
Make sure gap between the bobbin case holder A
and the opener
is
approximately 0.2mm.
c)
If
the gap
is
too large or
small,
loosen the opener
holder set screw
Band
adjust position
of
the opener.
Approx.
0.2mm
16. Relationship between needle motion
and
feed dog motion
a)
Set feed length to
"0"
on the feed setting dial
b) Lean the machine head backward.
c) Loosen the feed lifting rock shaft crank set screws A and B
A
Opener
Screw
.-----------------------------.
d) Set the needle at the lowest position.
e) Adjust the distance between presser rod and vibration
prevention rod to 9mm and temporarily tighten the feed
lifting rock shaft crank set screws A and B
t)
Check that the right feed lifting rock shaft crank
is
connected with the link at right angle,
as
shown in Figure.
g)
If
the connection
is
not at right angle, remove the back
cover, loosen screw C and move the right link to connect
the right feed lifting rock shaft with the link at right angle.
-10-
Link
From the library of: Superior Sewing Machine & Supply LLC
h)
After the completion
of
adjustment, fully tighten the screws A , B and
C.
• At this time make certain that needle can enter the
feed dog needle hole at the center
of
the hole.
I
I
~;:r--'
9mm
17. Safety clutch device:
Needle
rod
Vibration
prevention
rod
Safety clutch device
is
installed to prevent the hook
and cog belt from damage in case the thread
is
caught into the hook when the machine
is
loaded
abnormally during operation.
(1)
Function ofsafety clutch.
a)
When the safety clutch acts, the cog belt pulley will
be
unloaded. then the rotation
of
hook shaft will stop.
Feed
lifting
rock
shaft
crank
(rlght)
The arm shaft only will rotate. Stop the operation
of
machine.
b)
Clean the thread thoroughly which
is
caught into the hook.
c)
Turn the cog belt hub by hand, and check whether the hook
Shaft rotates lightly and properly, place the clutch device as
follows.
(2)
How to set the safety clutch.
a)
While pressing down the push button on the opposite side
of
bed by left hand, turn the balance wheel slowly by right
hand away from you as shown
in
the figure.
b)
The balance wheel will stop by the gear plate,
but turn the balance wheel more firmly.
c)
Release the push button.
d)
As shown
in
the Figure, the safety clutch device
is
set.
-
11-
~·
.....__
Safety
clutch
Cog
belt
pulley
Cog
belt
hub
_.->' ·· Push button
From the library of: Superior Sewing Machine & Supply LLC
(3)
Force applied to the safety clutch.
a) The force applied to the safety clutch
is
the
smallest when the white mark
of
the eccentric
pin faces the center
of
the lower shaft. The
force proportionally increases as the white mark
faces the outside.
b)
To
adjust the force slide the timing belt, loosen
the set screw, and turn the eccentric pin.
White
marl<
Timing
Be~
Eccentric
Pin
Strengthen
Low
Shaft
Eccentric
Pin
c) After the adjustment, make sure to fasten the set screw.
18. Upperfeed
adjustment
(Needle side)
If
the uneven feeding occurs according to the fabric,
Adjust the long hole
of
the horizontal feed shaft crank
(right) to adjust the upper feed length. (How to adjust)
a) Loosen the special bolt.
b) Move the special bolt upward to decrease upper feed.
Horizontal
shaft
crank,righl
c) Move the special bolt downward to increase the upper feed. The upper feed and the lower feed
theoretically becomes equal at the reference line on the horizontal feed shaft crank.
d) Securely tighten the special bolt after adjustment.
19. Outside presser foot
and
inside presservertical stroke
adjustment
When fabric with large elasticity
is
sewn, or when thickness
of
fabric changes, the vertical stroke
(movable range)
of
the presser feet should
be
adjusted as follows:
Adjustment
a) Loosen the special bolt.
b) The vertical strokes
of
the presserfeet become
c) maximum when the crank rod
is
moved upward and set.
d) The vertical strokes becomes minimum when the nut
is
moved downward and set.
e) After the adjustment, fully tighten the special bolt.
Spacial
bo~
~Increase
~
r~
Crank
rod
The vertical strokes
of
the presser feet can be adjusted within a range from 6mm to 2mm.
20.
Adjustment
Screwing the pin that connects the link
of
back-sewing with the crank
of
back-sewing (down) can
adjust the tolerance
of
between the stitches. Screwing the pin
in
clockwise can increase the stitch
of
forward sewing; otherwise, the stitch ofback-sewing will be increased.
-12-
From the library of: Superior Sewing Machine & Supply LLC
21. Installation
of
movable knife
(1)
Installation
of
movable knife
a.
Turn the balance wheel and lower the needle bar to the lowest position.
b.
Push the cam follower crank so that the cam roller enters into the thread trimmer cam groove.
c.
Turn the balance wheel until the black mark point on the arm meets the white mark point on the
balance wheel. Set the cam follower crank at this position with a screwdriver temporarily preventing
the cam roller coming out from the cam groove.
d.
Loosen the thread trimmer rocking crank clamp bolts A and B.
e.
Adjust the movable knife so that the movable knife end slant portion protrudes
0-0.5
mm
from the fixed knife, as shown
in
Figure and tighten the bolts A and
B.
Bo~
A
Thread trimmer
rocking crank
Thread trimmer
rockmg
crank
(2)
Gap
between movable knife
and
bobbin case holder
stopper
.-------------,
a. Turn the balance wheel by hand until needle reaches the
Lowest position.
b. With the needle at the lowest position, depress cam follower
crank, turn the balance wheel until the movable knife reaches
the extremity
of
its stroke.
c. Manually rotate the inner hook in the direction indicated by
arrow
in
Figure and adjust gap between the movable knife
Monable
knife
and the inner hook stopper to about 0.5 mm (the screws A and B should be loosened for this
adjustment).
22.
Adjustment
of
thread
trimmer
cam
a. Turn the balance wheel by hand until the needles reach the lowest position.
b. Maintaining the needle position, depress the cam follower crank and put the cam roller into the
groove
of
thread trimmer cam.
c. Turning the balance wheel by hand, adjust the thread trimmer cam so that the movable knife starts
moving when the green mark point on the balance wheel comes
in
line with the black mark point on
-
13
From the library of: Superior Sewing Machine & Supply LLC
the arm. Note:
To
adjust, loosen two thread trimmer cam clamp screws A.
Thread
trimmer
cam
23.
Adjustment
of
needle
threads
tension release assembly
Green
mark
point
Black
mark
point
a. Tum the balance wheel by hand until the needles reach the lowest position.
b. Maintaining the needle position, depress the cam follower crank and put the cam roller into the groove
of
thread trimmer cam.
c. Turning the balance wheel by hand, adjust the thread tension release cam so that the tension disc close
when the white mark point on the balance wheel comes
in
line with the black mark point on the arm.
To
adjust, loosen two tension release cam clamp screws A.
d. Opening degree
oftension
disc should be adjusted with the tension release roller B mounted on the
convex portion
of
thread release cam, as shown
in
Fig.
To
adjust, loosen the screws C and draw the wire.
e. Make fine adjustment by loosening the nut
D.
f. Loosen the nut D and make the outer casing approach rightward to increase the opening value.
White
park
point
Thread
Nut
D
24.
Adjustment
of
scissoring pressure
of
movable knife
and
fixed knife
a.
Loosen the fixed knife bracket clamp bolt A.
-14-
From the library of: Superior Sewing Machine & Supply LLC
b.
Tum the vertical position adjusting screw B to adjust meshing pressure
and
then righter the hexagon
socket head cap screwA.
Note: Since excess pressure causes large
torque
to
the thread trimming mechanism
and trimming failure, adjust it so that
thread can be trimmed with minimum
pressure.
c. Move the movable knife and check that
the thread can be sharply trimmed.
Fixed
knife
bracker
Hexagon
socket
head
cap
~:cr-ew
A
Vertical
position
adjustinc
screw
B
25.
Sharpening
of
fixed knife
When the knives dull, the fixed should be sharpened
as
iiiustrated
in
Fig. Since it
is
very difficult to sharpen the movable knife,
replace
it
with a new one when
it
dulls.
26.
Adjustment
for
change
of
needle-to-needle distance
(1) Replace the throat plate, feed dog and needle clamp.
(Since the throat plate and feed dog are special parts designed
for thread trimming machine, be sure to use those specified by us.)
(2) Lean the machine head backward.
(3) Loosen two connecting link
clamp bolts J.
(4) Remove the spring
M.
(5) Loosen the hook bracket clamp
screws A and
Band
adjust gap
between each needle and hook.
(
6)
When the needles and hooks have
been adjusted, install the spring
M.
Screw A
(7) Contact the rocking cranks
screw
B
C and D to the stopper pins E and F and tighten the connecting link clamp bolt
J.
(8) Turn the balance wheel by band until the needles reach the lowest position.
(9) Loosen the nuts G and H.
cam
(10) Depress the cam follower crank K and adjust the connecting rod L so that the cam roller can
smoothly enter the groove
of
thread trimmer cam.
(11) Adjustment
of
the cam groove and the cam roller
-15-
From the library of: Superior Sewing Machine & Supply LLC
i.
Push the cam follower crank K so that the cam roller enters into the cam groove.
ii.
Turn the connecting rod
Land
adjust the clearance between the cam roller and the cam
groove surface L as small as possible, and tighten the nuts G and H.
iii. Push the cam follower crank K again and check that the cam roller enters into the thread
trimmer cam groove smoothly.
SPECIFICATIONS
Model
GC20618-1
GC20618-2
GC20618-1-D
GC20618-2-D
Number Single-needle Double-needle Single-needle Double-needle
Application Heavy material
Max. sewing speed 2000(rpm)
Stitch length 0"'-'9(mm)
Thread take-up lever 74.5(mm)
stroke
Needle-bar stroke 36(mm)
Presser-foot stroke 16(mm) by Leg 8(mm) by hand
Vertical stroke
of
upper feed 2"'-'6(mm)
Needle No.
DPX
17
#23
Hook r)fizontal full-rotating) Large
Thread take-up lever Slide lever
Stitch adjusting Dial
system
Lubrication system Automatic lubrication
Motor motor I
i Servo motor 550W
Needle Standard 6.4(mm)
gauge Special 3.2 4 4.8 8 9.5 12.7
16
19
25.4(mm)
Note: + Some materials, gauge sizes, and/or sewing conditions may require specifications other than
those listed above.
+ Feed dog, throat plate, rotating hook, bobbin case and bobbin should be those designed for thread
timer.
+ Bobbin should be
of
high quality free from deformation.
+ This specification
is
subject to change for machine improvement.
From the library of: Superior Sewing Machine & Supply LLC
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